package com.hmdp.service.impl;

import cn.hutool.core.bean.BeanUtil;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.hmdp.dto.Result;
import com.hmdp.dto.UserDTO;
import com.hmdp.entity.Follow;
import com.hmdp.mapper.FollowMapper;
import com.hmdp.service.IFollowService;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.hmdp.service.IUserService;
import com.hmdp.utils.UserHolder;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Service;

import java.util.List;
import java.util.Set;
import java.util.stream.Collectors;

/**
 * <p>
 *  服务实现类
 * </p>
 *
 * @author 虎哥
 * @since 2021-12-22
 */
@Service
public class FollowServiceImpl extends ServiceImpl<FollowMapper, Follow> implements IFollowService {
    @Autowired
    private IUserService userService;
    @Override
    public Result followCommons(Long id) {
        //获取用户id
        Long id1 = UserHolder.getUser().getId();
        //求交集
        Set<String> intersect = stringRedisTemplate.opsForSet().intersect(FOLLOW + id1, FOLLOW + id);
        if (intersect==null || intersect.isEmpty()){
            return Result.ok();
        }
        List<Long> collect = intersect.stream().map(Long::valueOf).collect(Collectors.toList());
        List<UserDTO> dtos = userService.listByIds(collect).stream().map(collects -> BeanUtil.copyProperties(collects, UserDTO.class)).collect(Collectors.toList());

        return Result.ok(dtos);
    }

    @Autowired
    private StringRedisTemplate stringRedisTemplate;
    private static final String FOLLOW="blog:follow:";
    @Override
    public Result isFollow(Long followUserId) {
        Long id = UserHolder.getUser().getId();
        Integer count = query().eq("user_id", id).eq("follow_user_id", followUserId).count();
        return Result.ok(count>0);
    }

    @Override
    public Result follow(Long followUserId, Boolean isFollow) {
        //获取用户id
        Long id = UserHolder.getUser().getId();
        if (isFollow){
            //关注
            Follow follow = new Follow();
            follow.setUserId(id);
            follow.setFollowUserId(followUserId);
            boolean save = save(follow);
            if (save){
                stringRedisTemplate.opsForSet().add(FOLLOW+id,followUserId.toString());
            }
        }else {
            //取消关注
            boolean remove = remove(new QueryWrapper<Follow>()
                    .eq("user_id", id).eq("follow_user_id", followUserId));
            if (remove){
                stringRedisTemplate.opsForSet().remove(FOLLOW+id,followUserId.toString());
            }
        }
        return Result.ok();
    }
}
